Circuit arrangement for comparing the synchronism or tracking be

Details Circuit arrangement for comparing the synchronism or tracking be Circuit arrangement for comparing the synchronism or tracking be

1979-07-31

1981-08-25

Schroeder, L. C.

Electricity: electrical systems and devices

Electrical speed signal processing systems

With speed comparison

324161, B60K 3100

Patent

active

042863066

ABSTRACT:
The synchronism or tracking between two analog signals is compared by a cuit arrangement having two inputs to which these analog signals are applied. A comparator circuit compares the two signals and provides a trigger or energizing signal to a switch which in turn produces an error signal when the two compared signals deviate from each other to an extent larger than a predetermined limit. One input is connected to the comparator circuit through a heterodyning circuit wherein the respective analog signal is heterodyned by a heterodyning signal which varies in its polarity. The comparator circuit includes a polarity detector which provides a signal signifying a positive or a negative difference between the amplitudes of the two polarity signals. A discriminator circuit is operatively connected to the comparator to provide a switch energizing signal when the difference signal does not have any zero transitions or passages with the frequency of the heterodyning signal.

REFERENCES:
patent: 3450943 (1969-06-01), Burke et al.
patent: 3919634 (1975-11-01), Appel et al.
patent: 4157126 (1979-06-01), Collonia
patent: 4170274 (1979-10-01), Collonia

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